69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
# Copyright 2013 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import logging
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import os
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from metrics import Metric
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class MediaMetric(Metric):
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"""MediaMetric class injects and calls JS responsible for recording metrics.
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Default media metrics are collected for every media element in the page,
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such as decoded_frame_count, dropped_frame_count, decoded_video_bytes, and
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decoded_audio_bytes.
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"""
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def __init__(self, tab):
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super(MediaMetric, self).__init__()
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with open(os.path.join(os.path.dirname(__file__), 'media.js')) as f:
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js = f.read()
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tab.ExecuteJavaScript(js)
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self._results = None
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def Start(self, page, tab):
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"""Create the media metrics for all media elements in the document."""
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tab.ExecuteJavaScript('window.__createMediaMetricsForDocument()')
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def Stop(self, page, tab):
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self._results = tab.EvaluateJavaScript('window.__getAllMetrics()')
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def AddResults(self, tab, results):
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"""Reports all recorded metrics as Telemetry perf results."""
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assert self._results
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for media_metric in self._results:
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self._AddResultsForMediaElement(media_metric, results)
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def _AddResultsForMediaElement(self, media_metric, results):
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"""Reports metrics for one media element.
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Media metrics contain an ID identifying the media element and values:
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media_metric = {
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'id': 'video_1',
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'metrics': {
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'time_to_play': 120,
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'decoded_bytes': 13233,
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...
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}
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}
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"""
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def AddOneResult(metric, unit):
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metrics = media_metric['metrics']
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for m in metrics:
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if m.startswith(metric):
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special_label = m[len(metric):]
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results.Add(trace + special_label, unit, str(metrics[m]),
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chart_name=metric, data_type='default')
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trace = media_metric['id']
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if not trace:
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logging.error('Metrics ID is missing in results.')
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return
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AddOneResult('decoded_audio_bytes', 'bytes')
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AddOneResult('decoded_video_bytes', 'bytes')
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AddOneResult('decoded_frame_count', 'frames')
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AddOneResult('dropped_frame_count', 'frames')
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AddOneResult('playback_time', 'sec')
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AddOneResult('seek', 'sec')
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AddOneResult('time_to_play', 'sec')
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